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	<title>Use the regular expression in CotEditor on Mac</title>
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<h1>Use the regular expression in CotEditor on Mac</h1>

<p>CotEditor uses the ICU-compatible regular expression library.</p>

<p>Refer to the user guide for the regular expression syntax provided by ICU for the find &amp; replace feature in CotEditor, the extraction of syntax highlighting and outline, and custom patterns for line sorting.</p>

<dl>
	<dt>ICU regular expression syntax</dt>
	<dd><a href="https://unicode-org.github.io/icu/userguide/strings/regexp.html" rel="external">Regular Expressions - ICU Documentation</a></dd>
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<h2>See also</h2>
<ul>
	<li><a href="syntax_highlight_settings.html">Define syntax highlighting in CotEditor on Mac</a></li>
	<li><a href="syntax_outline_settings.html">Define Outline extraction rules in CotEditor on Mac</a></li>
	<li><a href="howto_find.html">Find or replace text in CotEditor on Mac</a></li>
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